Please deprecate this package in favor of `passport-github2`

[niftylettuce]

Hello @jaredhanson - can you please deprecate this per #15 (comment)?

You will need to do the following:

• npm deprecate passport-github "This package is deprecated and no longer maintained. Please use passport-github2 instead"
• Archive the repository on GitHub and put a notice at the top of README in the GitHub description of "This package is deprecated and no longer maintained. Please use passport-github2 instead"

[YasharF]

@jaredhanson